Telautograph.



E. BELIN.

TBLAUTOGRAPH.

APPLICATION FILED JAN. 17, 1908.

Patented Mar. 16, 1909.

forms and dimensions.

EDOUARD BELIN, OF PARIS, FRANCE.

TELAUTOGRAPH.

Specification of Letters Patent.

Patented March 16, 1909.

Application flied January 17, 1908. Serial No. 411,281.

T 0 all whom it my concern:

Be it known that I, EDOUARD BELIN, a citizen of the Republic of France,residing at Paris, in the Republic of France, engineer, have inventedcertain new and useful Improvements in Telautographs, for whichapplication has been made in France, January 24, 1907, and August 1-,1907; in Austria, December 14, 1907, in Switzerland, December 24, 1907;in Luxembourg, 7197, Decemher 30, 1907; in Denmark, January 3, 1908; inHungary, January 3, 1908; and in Sweden, December 31, 1907 Theapparatus, to be distinguished by the name-of "telestereograph,has forits object to reproduce at a distance an original hotograp by anotherphotogra h whic is a copy of'the first. It allows o-f this'reproductionbeing made of'.the same size, or enlarged or reduced, as a positive ornegative, or stronger or weaker, at will.

The telestereogra h also allows of any drawin writing or lilie tracingbeing reproduced y photo-chemical means, provided that such originalshave at the start some relief however low.

The name of telestereograph has been given to this a paratus because itreproduces pictures the tints of which are shown at the start byproportionate reliefs. a

The telestereograph, does not comprise like other apparatus previouslysuggested, any chemical agent possessing variable properties, such as.selenium. It Workslikea telegraph aparatus bymechanical movements:

Like al transmitting apparatus of this kind, the telestereograph.necessitates two stations, the one, a transmitter, at thesending-place, the other, a receiver, at the place of arrival. These twostations possess parts which must be animated with strictly synchronousmovements and this result is obtained b those emp oyed in ,teegraphy,correction being able to be made, for instance at each turn.

The accompanying grammatically the capable of numerous variations asregards A is the transmitt ng st-ation and B the ing a resis an arranement analogous tov drawing shows dia-. If a convergent fixedtelestereograph appa- 'ratus, the practical construction-of which'is"projected on It is well known that colloidal bichromate preparations(gelatin mates) are sensitive to light and that the layer formed is theless soluble the more intense the light has been; by development in hotwater a relief is obtained, the heights of which are strictlyproportionate 'to the luminous intensities. It is this well known proerty which forms the basis of photoglyp y and the Woodbury typieprocess. A-ssumin -then that a suitable p process b gelatin, and that,after the proof 1 in relief thereby obtained has been placed on a roller2 at .the transmitting station A having a retary movement around a fixedpin 3 so as to im art to it a translation movement, it is trace by meansof a stylus 4 fixed on a lever which is only movable in its plane aroundan .axis 6, it is evident "that the part of the lever 5 opposite thestylus 4 will beangularly displaced and its extremity will displacedalong a fixed resistance 8 or a row of contacts insulated one fromanother, and

respectively connected with bobbins formtance box. Under .theseconditions it is quite evident that if the resistance or resistances 8and the slider 7 in series I complete an electric line circuit ofconstant voltage, and constant external resistance, the absoluteintensity indicated by any, suitable alvanometer introduced in thiscircuit wil vary according to the position of the slider 7 andconsequently according to the relief of the proof 1 moving under thestylus 4 at the transmitting station A. Under these conditions'a verysensitive mirror galvanometer such bifilar one, or an bscillog'ra h, isarranged at the receiver station '13. nder the action of the variableline'current the said mirror will thus turn about its int of suspension.

rays emanating from a suitable source 11 he the mirror 10, passingthrough a lens 12 arranged in such a Way that the rays emanating fromthe source 1 1 are brought .to a focus on the said mirror,

and alkaline bichro- 65 otographic I ock be reproduced on bichromated 65describe arcs '75 I of a circle the length of which will'be proforinstance as a ominous bundle of this latter considered in its turn as aluminous source gives rise to a reflected pencil which is dis lacedsimultaneously with the mirror an in a plane at right angles thereto,these displaceever may ments always corresponding to the variations ofthe line current and consequently to the deflections of the galvanometer9.

In the path of the reflected luminous penoil a converging lens 12 ismounted in such a way that the point of reflection of the mirror 10always falls on its rinci al axis. If these conditions are exact y fuled, an image of the point x will be obtained at X, always at the sameoint of the principalaxis what- Ee the angle of reflection. At thispoint or conjugate focus of the luminous pencil traversing the lens 12the receiving sensitive surface 13 is placed (a photographic film forinstance) wound on a cylinder 14 having a rotary motion and an identicaltranslation movement, superior or inferior to, but always synchronouswith, that conmunicated to the cylinder 2 carrying the proof 1 at thetransmitting station A.

A scale 15 of colors strictly graded extending from black to white isarranged on the path of the luminous pencil reflected by the mirror 10,before" or behind the lens 12 or even on this latter. By thisarrangement the intensity of the luminous pencil emitted by the mirror10 will vary like the diflerent points of this scale according to theposition which the line current traversing the galvanometer 9 will causeit to assume and consequently according to thevariations of the reliefwhich pass. under the stylus 4 at the transmitting station A. Underthese conditions it is evident that the luminous pencil reflected by themirror 10 will make a more or less energetic impression on the sensitivesurface 13, always proportionate to the reliefszof the original image 1.

By reversing the scale 15 of colors, that is to say, by causing it toturn through 180, the image recorded will be changed; it will then bepositive ifthe proof 1 at the transmi'tting station is negative andvice-versa, further by substituting for a normal scale of colors, scalesof exaggerated or insufiicient gradation, thefprints recorded will bethen strengthened or weakened.

The foregoing specification shows clearly how the various parts of thetelestereogra h are arranged and operate, and it is evi ent that theform and dimensions of the apparatus in practice may give rise tonumerous modifications. This practical apparatus may also-comprise partsfor supporting the essential devices, which parts have nothing to dowith the working of the apparatus. The receiving station is a so comleted by a dark room 16 inclosing the cylinder 14, this chamber having asing e opening closed by 9. dia hragm 17.

t is hereinbefore stated that the cylinder tary movement so as to avoidany deformation of the icture and similarly the opening of the diap ragm17 will be modified in a suitable manner in each case.

The original print 1 has hereinbefore been considered as a photographtaken on bichromated gelatin treated in a suitable manner,

but it must be evident that this original print may consist of andrawing, writing or the like obtained in re ief or in intaglio on ankind of foundation.

11 order to obtain a scale 15 of normal tints I operate as follows :Acircular screen perforated with an aperture arranged on a radius andsuch that the different points of the plate receive quantities of lightarranged according to the geometrical progression of ratio 2,-2, 4, 8,and the like is displaced in front of a bromid of silver photographicplate. Under these conditions the capacity of the photogra hic layerdeveloped is proportionate to t e logarithms of the quantities of light.

The strengthening and weakening scales are made in the same way butaccording to other ratios and they may thus be varied in definitely. Aseries of these scales may be laced on the same disk so as to changethem by a simple rotation of the latter. It will suflice in this casethatthe central region of the various scales has the same value.

I declare that what I claim is 1. Apparatus for transmitting to adistance by telegraphic or telephonic methods any graphic representationhaving a surface in relief to a slight extent, comprising means fortranslating the variations in the relief into-variations in electricintensity, means for. transmitting said electrical variations to adistance, means for translating said electrical variations intovariations of light intensity, and means for recording the lastmentioned variations.

2. Apparatus of the kind set forth comprising a stylus, means forbringing said styus successively into contact with different parts ofthe representation to be transmitted, means for translating the movementof the stylus due to variations in the relief of the representationintovariations of electrical intenslty, means for transmitting saidelectrical variations, means for translating said 7 electricalvariations into variations of light intensity and means for recordingthe last mentioned variations.

Apparatus-of the kind set forth comrising a stylus, means for bringingsaid styus successively into contact with different parts of therepresentation to be transmitted, an electric transmission circuit,means, controlled by the movement of the stylus due to variations in therelief of the representation, for varying the current intensity in saidcircuit, means for translatin said current variations into variations of%ight intensity and means for recording the last mentioned variations.4. Apparatus of the kind set forth, comprising a stylus, a cylindricalsup ort for the representation to be transmitte means for producingrelative movement between said stylus and the said support so that theline of contact passes in a helical course along the cylinder, anelectric transmission circuit, means, controlled by the movement of thestylus due to variations in the relief of the representation, forvarying the current intenslty in said circuit, means for translatingsaidcurrent variations into variations of t intensity, and means forrecording the last mentioned variations.

5. Apparatus of the kind set forth, comprising a stylus, means forbringing said styus successively into contact with different parts ofthe representation to be transmitted, an electric transmission circuit,means, controlled by the movement of thestylus due to variations in therelief of the representation, for varying the resistance of saidcircuit, means for translating the current variations thereby producedinto variations of light intensity, and means for recording the last:mentioned variations.

6. Apparatus of the kind set forth, comprising means for translating thevariations in the relief of the representation to be transmitted intovariations in electric intensity, means for transmittin said electricalvariations tb a distance, an means for translating said electricalvariations into variations of light intensity, said last mentioned meanscom rising a mirror adapted to be angularly disp aced by the saidelectrical variations,

' means for projecting a pencil of light on to said mirror, means fordirecting to a fixed point the pencil of light reflected from saidmirror means for varyin the intensity of said reflected light accordingto the angular osition of the mirror, and means for recordthe lastmentioned variations. 7 Apparatus of the kind set forth, comrising meansfortranslating the variations in the relief of the representation to betransmitted into variations in electric intensity, means fortransmitting said electrical variations to a distance, and means fortranslat ing said electrical variations into variations of lightintensity, said last mentioned means comprising a mirror ada ted to beangularly displaced by the said electrical variations, means forprojecting a pencil of light on to said mirror, means for directing to afixed point the pencil of light reflected from said mirror, a screen ofgraduated transparency inserted in the path of the reflected pencil andproducing variations in the intensity of said pencil according to theangular position of the mirror, and means for recording thelast-mentioned variations.

8. Apparatus of the kind set forth, comrising means for translating thevariations in the relief of the representation to be transmitted intovariations in electric intensity, means for transmitting said electricalvariations, means for translating said electrical variations intovariations of light intensity and means for recording the last mentionedvariations, said last-mentioned means comprising a chamber, a supportfor a sensitive surface located in said chamber, and means for movingsaid support relative to an aperture in the wall of said chamber.

9. In apparatus of the kind set forth, the combination with atransmitting apparatus comprising a stylus, means for bringin saidstylus successively into contact wlth different parts of therepresentation to be transmitted, and means controlled-by the movementof the stylus due to variations in the relief of the representation, forvarying the intensity of the electric transmissioncurrent; of areceiving apparatus comprising means for translating the variations inthe transmission current into variations in the intensity of a pencil oflight directed u on a fixed point, a support a apted to hol part of asensitive surface at said point, and means for movin said support tobring different parts of t e sensitive surface to the said point.

10. In apparatus of the kind set forth, a receiving apparatus comprisinga mirror galvanometer connected with a transmission line, an opticalsystem upon which the pencil of light reflected b the mirror is recelvedand by which it is 're ected to a'fixedpoint, a screen interposed in theath of the pencil of light, said screen being 0 graduated transparencand serving to vary the intensity of the re ected pencil, a dark chamberin the wall of which there is an aperture located at the point to whichthe reflected pencil is directed, a support for a sensitive surfacelocated behind said aperture, and means for moving said support so as tobring different parts of the sensitive surface 1n succession under theinfluence of the light passing through the aperture.

11. In apparatus of the kind set forth for use in transmittingrepresentations devoid of half tones, means for translating thevariations-in the relief of the representation into variations in thetransmission current, said In Witness whereof, I have hereunto signedvariations being reduced by the opening my name'this 6th day of January1908, in andclosing of an e ectrical circuit, means for the presence oftwo subscribin witnesses. transmitting said variations, means for EDOUARBELIN.

5 translating said electrical variations into I Witnesses:

variations of light intensity, and means for ANTONIN MONTEILBET,recording the last-mentioned variations. H. O. OOXE.

